JPH03297045A - Fluorescent lamp for use in cryogenic environment - Google Patents

Abstract

PURPOSE:To reduce the power consumption and the price by accommodating a pendant type fluorescent lamp and an incandescent lamp in a warm keeping cylinder in opposite arrangement, and changing over from the incandescent lamp to fluorescent and vice versa according to the internal temp. of the warm keeping cylinder. CONSTITUTION:A bimetal switch 3 is connected to a contact A of an incandescent lamp 2 when the internal tamp. of a warm keeping cylinder 5 is below 10 deg.C, and is connected with a contact B of a fluorescent lamp 1 over 10 deg.C. If the power supply is loaded while the temp. is below 10 deg.C, the incandescent lamp is lighted up to illuminate the surrounding and heat the inside of the warm keeping cylinder 5 with radiation. When the internal temp. of the warm keeping cylinder rises exceeding 10 deg.C, the bimetal switch 3 is connected with the contact B, and the incandescent lamp 2 is put off while the fluorescent lamp 1 put on to illuminate the surrounding and heat the inside of the cylinder 5. This reduces the power consumption, and also suppress the cost because the structure is simple and because this does not require any special parts.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to a fluorescent lamp suitable for use in low temperature areas.

[Prior Art] In fluorescent lamps used in low-temperature areas, the pressure of mercury vapor within the lamp decreases, and the atoms of mercury vapor decrease.

Therefore, there is a problem in that the illuminance of the fluorescent light decreases.

For this reason, various types of fluorescent lamps have been developed that do not reduce illuminance even in low temperature ranges. Regarding such fluorescent lamps, a published patent document is JP-A-62-5552.

In this method, metal powder is provided along the longitudinal direction of the inner wall of a tube provided with electrodes at both ends to form a heating element, and this heating element is energized when the lamp is turned on.

[Problem to be solved by the invention] The decks of icebreakers, etc. that sail in the waters of the Antarctic and the Arctic are exposed to the outside air, so the ambient temperature of fluorescent lights installed for illuminating the decks is -20°C. It becomes below. At such temperatures, ordinary fluorescent lamps will not turn on, so special fluorescent lamps equipped with heating elements as described above are used. However, the fluorescent lamp has problems in that it requires a current to flow through the heating element during lighting, consumes a large amount of power, and is expensive due to its special structure.

[Means for Solving the Problems] The present invention is an attempt to solve the above-mentioned problems, and includes a light-transmitting bimetal switch that switches between fluorescent lights, incandescent lights, and both lights, with both ends closed. This is a low-temperature fluorescent light that is housed in a heat-insulating tube.

[Function] When the temperature inside the heat-insulating tube falls below a predetermined temperature, the bimetal switch is connected to a circuit that turns on the incandescent lamp, and the incandescent lamp lights up, warming the inside of the heat-insulating tube and serving as an illumination light. When the temperature inside the insulation cylinder rises above a predetermined temperature, the bimetal switch is activated, opening the incandescent lamp lighting circuit and switching to the fluorescent lamp lighting circuit. The fluorescent light is turned on, and since the fluorescent light is housed in a heat insulating tube that is isolated from the outside air, the ambient temperature of the fluorescent light stays above the predetermined temperature for a long time due to heat radiation from the fluorescent light. Note that when the ambient temperature of the fluorescent light falls, the incandescent light is turned on to warm it up, and the temperature inside the heat insulating tube (the ambient temperature of the fluorescent light) rises above the predetermined temperature. Then, the incandescent lights go out and the fluorescent lights come on. That is, after the lamp is turned on, either the fluorescent lamp or the incandescent lamp is turned on and serves as an illuminating lamp.

[Example] An example of the present invention will be described below based on the drawings. 1st
The figure is a circuit diagram of a low-temperature fluorescent lamp according to the present invention, and FIG. 2 is a diagram showing an outline of the structure of the low-temperature fluorescent lamp according to the present invention. In FIG. 1, 1 is a pendant type fluorescent light, and 2 is an incandescent lamp, which serves as an illuminating light between heating the inside of the heat-insulating tube 5 and until the fluorescent light is turned on. 3 is a bimetal switch that turns on the incandescent lamp 2 depending on the temperature inside the heat insulating tube 5.
Connect to contact A of or contact B of fluorescent light 1. 4 is a ballast for the fluorescent lamp 1, which is provided in the circuit of the fluorescent lamp 1.

In FIG. 2, an incandescent lamp 2 is provided facing a pendant fluorescent lamp 1, and these lamps are connected to a light-transmitting heat-insulating tube 5.
is stored inside. Reference numeral 6 denotes a lid attached to one end of the heat insulating tube 5, and a cap for attaching the incandescent lamp 2 is provided on the front surface of the lid.

Reference numeral 7 denotes a lid attached to the other end of the heat insulating tube 5, and an insertion opening into which the base bottle of the pendant type fluorescent lamp 1 is inserted is provided on the front surface of the lid. 116.7 is screwed into the end of the heat insulating cylinder 5, and is attached and fixed by fitting or the like.

The amount of luminous flux of the fluorescent lamp 1 decreases when the ambient temperature drops below 15° C. From the safety aspect of walking or working, it is necessary to take into consideration that the amount of luminous flux of the fluorescent lamp 1 does not decrease below a certain value. If the lower limit of the luminous flux of fluorescent lamp 1 is set to 80%, fluorescent lamp 1
The ambient temperature must be maintained at 10°C or higher. Therefore, the operating temperature of the bimetal switch 3 is set to 10°C. In addition,
The operating temperature of the bimetallic switch may be varied within a range of 5 to 15°C depending on the conditions of the place to be illuminated.

Next, a lighting situation when the fluorescent lamp of the present invention is turned on in a low temperature area where the outside air temperature is 20° C. or less will be described.

The bimetal switch 3 has a temperature inside the insulation cylinder 5 of 10°C.
When the temperature is below 10°C, it is connected to the contact A of the incandescent lamp 2, and when the temperature is above 10°C, it is connected to the contact B of the fluorescent lamp 1. Under such temperatures, the temperature inside the heat insulating cylinder has fallen to less than 10° C., so the bimetal switch 3 is connected to the contact A. When the power is applied, (1) the incandescent lamp lights up, illuminating the surrounding area and warming the inside of the heat insulating tube 5 by heat radiation.

- When the internal temperature rises to 10°C or more due to heat retention, the bimetal switch 3 connects to contact B, the incandescent lamp 2 goes out, and the fluorescent lamp 1 turns on. The fluorescent light 1 illuminates the surrounding area and also heats the interior.

When the outside air temperature is low and the amount of heat radiated from the heat insulation cylinder is large, the internal temperature may drop to less than 10°C. In such a case, the incandescent lamp is turned on and the steps (1) and (2) above are repeated.

[Effects of the Invention] The present invention has an oval configuration in which a pendant fluorescent lamp and an incandescent lamp are housed facing each other in a heat-retaining cylinder, and the incandescent lamp and fluorescent lamp are switched depending on the internal temperature such as heat-retaining. There is a similar effect.

(1) Fluorescent lights can be used even in low-temperature areas such as icy waters.

■At first, the incandescent lamp lights up, illuminating the surrounding area and warming the inside of the heat insulating tube, and switches to the fluorescent lamp at a temperature where the luminous flux of the fluorescent lamp is sufficient, so it is sufficient even in low-temperature areas such as icy waters. Lighting is possible.

e) When the internal temperature is low, such as when keeping warm, the incandescent lamp is turned on, and after the temperature rises, the incandescent lamp is turned off and the fluorescent lamp is turned on, so power consumption is lower than that of conventional fluorescent lamps.

(a) It is inexpensive because it does not require special parts and has a simple structure.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram of a low-temperature fluorescent lamp according to the present invention, and FIG. 2 is a schematic structural diagram of a low-temperature fluorescent lamp according to the present invention. 1...Fluorescent light, 2...Incandescent light, 3...Bimetal switch, 5...Heat insulation cylinder, 6, 7... Lid.

Claims (1)

[Claims] A low-temperature fluorescent light characterized by a fluorescent light, an incandescent light, and a bimetallic switch for switching the lighting of both lights housed in a light-transparent heat-insulating tube with both ends closed.